High-precision machining method for straight-edge fan-shaped magnetic pole side face of cyclotron

Abstract

The invention relates to the technical field of electromagnetic measurement, in particular to a high-precision machining method for the side face of a straight-edge fan-shaped magnetic pole of a cyclotron, and the method comprises the steps: obtaining the adjusted cutting depth parameter of each magnetic pole according to the machining height difference, the cutting abnormal degree, the average roughness and the initial cutting depth; screening all the magnetic poles according to the local roughness of each point cloud data on the surface of each magnetic pole to obtain a to-be-adjusted magnetic pole and a non-adjusted magnetic pole; according to the difference condition of the adjusted cutting speed parameter, the adjusted cutting feed quantity parameter and the adjusted cutting depth parameter between the magnetic pole to be adjusted and the non-adjusted magnetic pole, the corrected cutting parameter of the magnetic pole on the cyclotron is obtained; and high-precision machining is conducted on the side face of the straight-edge fan-shaped magnetic pole of the cyclotron based on the corrected cutting parameters of the magnetic pole. The consistency between the magnetic poles and the precision of the magnetic pole side face machining method are improved.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic measurement technology, and in particular to a high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole. Background Art

[0002] A cyclotron is a device that uses a magnetic field to make charged particles perform cyclotron motion, and repeatedly accelerates them through a high-frequency electric field during motion. Since the performance of a cyclotron depends largely on the uniformity and isochronism of the magnetic field, high-precision processing of the sides of the straight-edged fan-shaped magnetic poles is an important factor in ensuring the precise distribution of the magnetic field. And the accuracy of the magnetic field directly affects the quality and stability of the particle beam. High-precision processed magnetic poles can reduce the error of the magnetic field, thereby improving the focusing degree of the particle beam and the uniformity of the energy distribution; The weight of the cyclotron is strictly limited during its design. It has a compact structure and a completely symmetrical four-blade straight-edge fan structure. The four-blade straight-edge fan magnetic poles are evenly distributed circumferentially about the center line of the part, requiring absolute symmetry, uniformity, and consistency. However, the current processing of the magnetic poles often adopts a split structure, and each magnetic pole block is processed separately in the same processing method and then assembled together. The separate processing of each magnetic pole requires high precision, which will lead to the defect of weakened consistency between the magnetic poles. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole, the method comprising: According to the point cloud data on the surface of each magnetic pole, the average roughness of each magnetic pole and the local roughness of each point cloud data on the surface of each magnetic pole are obtained; the point cloud data on the surface of each magnetic pole are screened by the local roughness to obtain the abnormal processing area of ​​each magnetic pole; according to the proportion of the abnormal processing area, the degree of cutting abnormality of each magnetic pole is obtained; According to the degree of cutting abnormality and the initial cutting speed, the adjusted cutting speed parameters of each magnetic pole are obtained; according to the adjusted cutting speed parameters and the initial cutting feed, the adjusted cutting feed parameters of each magnetic pole are obtained; according to the distribution of point cloud data on the surfaces of all magnetic poles, the processing height difference of each magnetic pole is obtained; according to the processing height difference, the degree of cutting abnormality, the average roughness and the initial cutting depth, the adjusted cutting depth parameters of each magnetic pole are obtained; according to the local roughness of each point cloud data on the surface of each magnetic pole, all magnetic poles are screened to obtain the magnetic poles to be adjusted and the non-adjusted magnetic poles; according to the differences in the adjusted cutting speed parameters, the adjusted cutting feed parameters and the adjusted cutting depth parameters between the magnetic poles to be adjusted and the non-adjusted magnetic poles, the corrected cutting parameters of the magnetic poles on the cyclotron are obtained, and the side surfaces of the straight-edge sector-shaped magnetic poles of the cyclotron are processed with high precision.

[0004] Preferably, the method of obtaining the average roughness of each magnetic pole and the local roughness of each point cloud data on the surface of each magnetic pole according to the point cloud data on the surface of each magnetic pole includes the following specific methods: For any magnetic pole on the cyclotron, inputting point cloud data of the surface of the any magnetic pole into a roughness measuring instrument to obtain the roughness of all point cloud data on the surface of the any magnetic pole; Taking the mean value of the roughness of all point cloud data on the surface of any one magnetic pole as the average roughness of any one magnetic pole; For any point cloud data on any magnetic pole surface, a neighborhood parameter is preset. , taking any point cloud data as the center of the spherical window, obtain the radius A spherical window is formed, and the spherical window is recorded as the local neighborhood range of any point cloud data; the average value of the roughness of all point cloud data within the local neighborhood range of any point cloud data is taken as the local roughness of any point cloud data.

[0005] Preferably, the method of screening the point cloud data on the surface of each magnetic pole by local roughness to obtain the abnormal processing area of ​​each magnetic pole includes the following specific methods: Preset a target roughness parameter For any point cloud data on the surface of any magnetic pole on the cyclotron, if the local roughness of any point cloud data is greater than or equal to the target roughness parameter , record any one of the point cloud data as abnormal point cloud data; use the Convex Hull algorithm to restrict all abnormal point cloud data on the surface of any one of the magnetic poles to form multiple closed areas, and all of them are recorded as abnormal processing areas.

[0006] Preferably, the specific method of obtaining the degree of cutting abnormality of each magnetic pole according to the proportion of abnormal processing areas includes: For any abnormal processing area of ​​any magnetic pole on the cyclotron, the ratio of the number of all point cloud data in the any abnormal processing area to the number of all point cloud data on the surface of any magnetic pole is recorded as the area ratio of the any abnormal processing area; the normalized value of the product of the cumulative sum of the area ratios of all abnormal processing areas of any magnetic pole and the number of all abnormal processing areas of any magnetic pole is taken as the cutting abnormality degree of any magnetic pole.

[0007] Preferably, the method of obtaining the adjusted cutting speed parameter of each magnetic pole according to the cutting abnormality degree and the initial cutting speed includes the following specific methods: For any magnetic pole on the cyclotron, the product of the cutting abnormality degree of the any magnetic pole, the inverse of the current cutting processing times and the initial cutting speed is recorded as the cutting speed adjustment factor of the any magnetic pole; the sum of the initial cutting speed of the any magnetic pole and the cutting speed adjustment factor is taken as the adjusted cutting speed parameter of the any magnetic pole.

[0008] Preferably, the method of obtaining the adjusted cutting feed parameter of each magnetic pole according to the adjusted cutting speed parameter and the initial cutting feed includes: For any magnetic pole on the cyclotron, the normalized value of the difference between the adjusted cutting speed parameter of any magnetic pole and the initial cutting speed is recorded as the cutting speed difference value; the product of the cutting speed difference value and the initial cutting feed of any magnetic pole is recorded as the cutting feed adjustment factor; the difference between the initial cutting feed of any magnetic pole and the initial cutting feed is used as the adjusted cutting feed parameter of any magnetic pole.

[0009] Preferably, the specific method of obtaining the processing height difference of each magnetic pole according to the distribution of the point cloud data of all magnetic pole surfaces includes: All point cloud data on the surfaces of all magnetic poles are fitted in a horizontal plane to obtain the overall processing base plane of the magnetic poles; for any magnetic pole on the cyclotron, all point cloud data on the surface of any magnetic pole are fitted in a horizontal plane to obtain the processing base plane of the any magnetic pole; the distance between the overall processing base plane of the magnetic pole and the processing base plane of any magnetic pole is used as the processing height difference of the any magnetic pole.

[0010] Preferably, the method of obtaining the adjusted cutting depth parameter of each magnetic pole according to the machining height difference, the degree of cutting abnormality, the average roughness and the initial cutting depth includes the following specific methods: For any magnetic pole on the cyclotron, the average roughness of any magnetic pole is compared with the target roughness parameter The difference is recorded as the first difference; the product of the first difference and the cutting abnormality degree of any one of the magnetic poles is recorded as the first product; the ratio of the first product to the machining height difference of any one of the magnetic poles is recorded as the cutting depth adjustment coefficient; The product of the initial cutting depth and the cutting depth adjustment coefficient is recorded as the cutting depth adjustment value; the difference between the initial cutting depth and the cutting depth adjustment value is used as the adjusted cutting depth parameter of any one magnetic pole.

[0011] Preferably, the method of screening all magnetic poles according to the local roughness of each point cloud data on the surface of each magnetic pole to obtain the magnetic poles to be adjusted and the magnetic poles not to be adjusted includes the following specific methods: For any magnetic pole on the cyclotron, the standard deviation of the local roughness of all point cloud data on the surface of the any magnetic pole is recorded as the roughness consistency of the any magnetic pole; Preset a fluctuation parameter , if the roughness consistency of any of the magnetic poles is less than or equal to the fluctuation parameter , record any one of the magnetic poles as a non-adjusted magnetic pole; if the roughness consistency of any one of the magnetic poles is greater than the fluctuation parameter , any one of the magnetic poles is recorded as the magnetic pole to be adjusted.

[0012] Preferably, the method of obtaining the corrected cutting parameters of the upper magnetic pole of the cyclotron according to the difference between the adjusted cutting speed parameter, the adjusted cutting feed parameter and the adjusted cutting depth parameter between the magnetic pole to be adjusted and the non-adjusted magnetic pole includes the following specific methods: For any non-adjustment magnetic pole, the absolute value of the difference between the average roughness of the any non-adjustment magnetic pole and the target roughness is recorded as the target difference of the any non-adjustment magnetic pole; among all non-adjustment magnetic poles, the non-adjustment magnetic pole with the smallest target difference is recorded as the target magnetic pole; The normalized value of the absolute value of the difference between the average roughness of all magnetic poles to be adjusted and the average roughness of the target magnetic pole is recorded as the roughness influence factor; The absolute value of the difference between the average of the adjusted cutting speed parameters of all magnetic poles to be adjusted and the adjusted cutting speed parameter of the target magnetic pole is recorded as the cutting speed influence factor; the product of the cutting speed influence factor and the roughness influence factor is recorded as the cutting speed correction factor; the difference between the adjusted cutting speed parameter of the target magnetic pole and the cutting speed correction factor is recorded as the corrected cutting speed parameter; similarly, the corrected cutting feed parameter and the corrected cutting depth parameter are obtained; The corrected cutting speed parameter, the corrected cutting feed parameter and the corrected cutting depth parameter are used as the corrected cutting parameters of the upper magnetic pole of the cyclotron.

[0013] The beneficial effects of the technical solution of the present invention are as follows: the present invention obtains the adjusted cutting depth parameters of each magnetic pole according to the processing height difference, the degree of cutting abnormality, the average roughness and the initial cutting depth; all magnetic poles are screened according to the local roughness of each point cloud data on the surface of each magnetic pole to obtain the magnetic pole to be adjusted and the non-adjusted magnetic pole; according to the difference in the adjusted cutting speed parameters, the adjusted cutting feed parameters and the adjusted cutting depth parameters between the magnetic pole to be adjusted and the non-adjusted magnetic pole, the corrected cutting parameters of the magnetic pole on the cyclotron are obtained; based on the corrected cutting parameters of the magnetic pole, the side surface of the straight-edge fan-shaped magnetic pole of the cyclotron is processed with high precision; by adapting the cutting parameters in the magnetic pole processing process, the consistency between the magnetic poles and the accuracy of the magnetic pole side processing method are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 The present invention is a flow chart of the steps of the high-precision machining method for the side surfaces of the straight-sided sector-shaped magnetic poles of a cyclotron. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the high-precision processing method for the side of the straight-edge sector-shaped magnetic pole of the cyclotron proposed by the present invention, its specific implementation method, structure, features and effects are described in detail as follows in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0017] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0018] The specific scheme of the high-precision machining method for the side surface of the straight-edge sector-shaped magnetic pole of a cyclotron provided by the present invention is described in detail below with reference to the accompanying drawings.

[0019] See also Figure 1 , which shows a flowchart of the steps of a high-precision machining method for the side of a cyclotron straight-edge sector-shaped magnetic pole provided by an embodiment of the present invention, the method comprising the following steps: Step S001: Acquire point cloud data of all magnetic pole surfaces on the cyclotron and initial cutting parameters corresponding to each magnetic pole; the initial cutting parameters include initial cutting speed, initial cutting depth and initial cutting feed.

[0020] Specifically, it is necessary to first collect the point cloud data of all magnetic pole surfaces on the cyclotron and the initial cutting parameters corresponding to each magnetic pole. The specific process is as follows: Using a laser scanner to collect point cloud data on the surfaces of all magnetic poles on the cyclotron, all point cloud data on the surface of each magnetic pole on the cyclotron are obtained; For any magnetic pole, the preset initial cutting speed is 300 mm / min, the initial cutting depth is 1 mm, and the initial cutting feed is 0.2 mm / r; the initial cutting speed, initial cutting depth and initial cutting feed are all used as the initial cutting parameters corresponding to any magnetic pole.

[0021] At this point, the point cloud data of all magnetic pole surfaces on the cyclotron and the initial cutting parameters corresponding to each magnetic pole are obtained through the above method.

[0022] Step S002: Based on the point cloud data on the surface of each magnetic pole, obtain the average roughness of each magnetic pole and the local roughness of each point cloud data on the surface of each magnetic pole; filter the point cloud data on the surface of each magnetic pole by local roughness to obtain the abnormal processing area of ​​each magnetic pole; based on the proportion of the abnormal processing area, obtain the degree of cutting abnormality of each magnetic pole.

[0023] It should be noted that cutting parameters are an important factor affecting the accuracy of magnetic pole machining. With the increase of cutting levels, the difference between the machined magnetic pole and the theoretical machining drawing becomes smaller and smaller, the allowable error decreases, and the requirement for accuracy gradually increases; therefore, the cutting parameters are not constant during the layer cutting process.

[0024] Preferably, in some implementations of the embodiments of the present invention, a specific method for obtaining the average roughness of each magnetic pole and the local roughness of each point cloud data on the surface of each magnetic pole according to the point cloud data on the surface of each magnetic pole is: Preset a neighborhood parameter , wherein this embodiment is based on This example is described as an example, and this embodiment is not specifically limited. Depends on the specific implementation situation; For any magnetic pole on the cyclotron, inputting point cloud data of the surface of the any magnetic pole into a roughness measuring instrument to obtain the roughness of all point cloud data on the surface of the any magnetic pole; Taking the mean value of the roughness of all point cloud data on the surface of any one magnetic pole as the average roughness of any one magnetic pole; For any point cloud data on the magnetic pole surface, take the point cloud data as the center of the spherical window and obtain the radius A spherical window is formed, and the spherical window is recorded as the local neighborhood range of the point cloud data; the average value of the roughness of all point cloud data within the local neighborhood range of the point cloud data is taken as the local roughness of the point cloud data.

[0025] Wherein, the spherical window is a three-dimensional sphere window.

[0026] Preferably, in some implementations of the embodiments of the present invention, the point cloud data on the surface of each magnetic pole is screened by local roughness to obtain the specific method of the abnormal processing area of ​​each magnetic pole: Preset a target roughness parameter , wherein this embodiment is based on This example is described as an example, and this embodiment is not specifically limited. Depends on the specific implementation situation; For any point cloud data on the surface of any magnetic pole on the cyclotron, if the local roughness of the point cloud data is greater than or equal to the target roughness parameter , and record the point cloud data as abnormal point cloud data; use the Convex Hull algorithm to restrict all abnormal point cloud data on the surface of any magnetic pole to form multiple closed areas, which are all recorded as abnormal processing areas.

[0027] It should be noted that if the average roughness of the current magnetic pole is less than the target roughness threshold, it means that the smoothness of the current magnetic pole surface meets the requirements of cyclotron acceleration magnetic pole processing, and no parameters are adjusted at this time; if the average roughness of the current magnetic pole is greater than or equal to the target roughness, it means that some areas inside the magnetic pole are not suitable for processing and there are obvious rough features, which means that the cutting parameters are inappropriate; the Convex Hull algorithm is a prior art and will not be described in detail in this embodiment.

[0028] Preferably, in some implementations of the embodiments of the present invention, the specific method for obtaining the degree of cutting abnormality of each magnetic pole according to the proportion of abnormal processing areas is: For any abnormal processing area of ​​any magnetic pole on the cyclotron, the ratio between the number of all point cloud data in the abnormal processing area and the number of all point cloud data on the surface of any magnetic pole is recorded as the area ratio of the abnormal processing area; the normalized value of the product of the cumulative sum of the area ratios of all abnormal processing areas of any magnetic pole and the number of all abnormal processing areas of any magnetic pole is taken as the cutting abnormality degree of any magnetic pole; The specific formula is: In the formula, Indicates the degree of abnormal cutting of the magnetic pole; Indicates the number of all abnormally machined areas of the magnetic pole; Indicates the magnetic pole The number of all point cloud data in the abnormal processing area; Represents the number of all point cloud data on the magnetic pole surface; represents the linear normalization function.

[0029] It should be noted that the more abnormal processing areas there are and the larger the area of ​​the abnormal processing areas, the more it means that there are significant magnetic pole anomalies in the processing, indicating that the current magnetic pole processing cutting parameters need to be adjusted to ensure the accuracy of magnetic pole processing; if the anomaly is more significant, it means that the current magnetic pole cutting parameters are seriously abnormal and do not meet the processing requirements for the side of the fan-shaped magnetic pole, then the greater the adjustment of the processing parameters.

[0030] So far, the cutting abnormality degree of each magnetic pole is obtained through the above method.

[0031] Step S003: according to the degree of cutting abnormality and the initial cutting speed, obtain the adjusted cutting speed parameters of each magnetic pole; according to the adjusted cutting speed parameters and the initial cutting feed, obtain the adjusted cutting feed parameters of each magnetic pole; according to the distribution of point cloud data on the surfaces of all magnetic poles, obtain the processing height difference of each magnetic pole; according to the processing height difference, the degree of cutting abnormality, the average roughness and the initial cutting depth, obtain the adjusted cutting depth parameters of each magnetic pole; according to the local roughness of each point cloud data on the surface of each magnetic pole, screen all magnetic poles to obtain the magnetic poles to be adjusted and the non-adjusted magnetic poles; according to the differences in the adjusted cutting speed parameters, the adjusted cutting feed parameters and the adjusted cutting depth parameters between the magnetic poles to be adjusted and the non-adjusted magnetic poles, obtain the corrected cutting parameters of the magnetic poles on the cyclotron.

[0032] It should be noted that the greater the degree of cutting abnormality, the greater the difference between the cutting roughness of the magnetic pole and the theoretical roughness, and the greater the amplitude adjustment of the cutting parameters is required to ensure the processing accuracy. However, the adjustment of cutting parameters cannot be infinitely magnified and is affected by the number of cutting times; in this case, it is believed that the cutting speed is too small, resulting in repeated cutting of these positions during the cutting process, and obvious cutting marks appear. It is necessary to increase the cutting speed to improve the cutting roughness of the side of the magnetic pole. However, with the increase in the number of processing times, the requirements for precision are gradually increased, and the cutting speed needs to be increased to prevent obvious processing textures from being left on the side of the magnetic pole due to the cutting speed being too low. Therefore, different cutting processes have certain requirements for the range of cutting speeds. In rough processing or when there is a high processing tolerance, a larger fluctuation range of the cutting speed can be given for faster processing efficiency. With the increase in processing accuracy, the fluctuation of the cutting speed decreases to prevent obvious textures from appearing.

[0033] Preferably, in some implementations of the embodiments of the present invention, the specific method for obtaining the adjusted cutting speed parameter of each magnetic pole according to the degree of cutting abnormality and the initial cutting speed is: For any magnetic pole on the cyclotron, the product of the cutting abnormality degree of the any magnetic pole, the inverse of the current cutting processing times and the initial cutting speed is recorded as the cutting speed adjustment factor of the any magnetic pole; the sum of the initial cutting speed of the any magnetic pole and the cutting speed adjustment factor is recorded as the adjusted cutting speed parameter of the any magnetic pole; The specific formula is: In the formula, Indicates the adjusted cutting speed parameter of the magnetic pole; represents the initial cutting speed; Indicates the degree of abnormal cutting of the magnetic pole; Indicates the current number of cutting operations of the magnetic pole.

[0034] It should be noted that increasing the cutting speed can effectively improve the accuracy of pole side machining, but the increase in speed will cause changes in the cutting force. Excessively fast cutting speed will significantly reduce the cutting force, which will cause impact and wear risks between the cutting tool and the machining pole. Therefore, there is a significant correlation between the cutting speed and the cutting feed, and a single adjustment cannot be made. That is, after increasing the cutting speed, more dense cutting marks are retained at the same time in order to prevent excessive feed from being subject to more obvious impact and wear risks. Therefore, the adjusted cutting feed is adjusted according to the change in the cutting speed.

[0035] Preferably, in some implementations of the embodiments of the present invention, the specific method for obtaining the adjusted cutting feed parameter of each magnetic pole according to the adjusted cutting speed parameter and the initial cutting feed is: For any magnetic pole on the cyclotron, the normalized value of the difference between the adjusted cutting speed parameter of any magnetic pole and the initial cutting speed is recorded as the cutting speed difference value; the product of the cutting speed difference value and the initial cutting feed of any magnetic pole is recorded as the cutting feed adjustment factor; the difference between the initial cutting feed of any magnetic pole and the initial cutting feed is used as the adjusted cutting feed parameter of any magnetic pole; The specific formula is: In the formula, Indicates the adjusted cutting feed parameter of the magnetic pole; Indicates the initial cutting feed; Indicates the adjusted cutting speed parameter of the magnetic pole; represents the initial cutting speed; represents the linear normalization function.

[0036] It should be noted that the above-mentioned adjusted cutting parameters are obtained according to the roughness of the pole side, but there are the following problems: as the number of layer cutting on the pole side increases, the remaining amount on the pole side becomes smaller and smaller. If the surface roughness of the pole material is abnormal, it is still necessary to evaluate it according to the roughness, but the layer cutting fault tolerance at this time becomes smaller; and the above only analyzes the cutting effect of each pole side individually. Since there may still be large differences in roughness between multiple poles, they do not have symmetry, uniformity and consistency; and the cutting depth of the pole side during the layer cutting process is an important factor affecting the consistency of the pole and ensuring the processing accuracy of the pole side. Therefore, the cutting depth needs to be adjusted in this process; and the cutting parameters: cutting speed and cutting feed rate should also be corrected to a certain extent as the number of layers of layer cutting increases.

[0037] Preferably, in some implementations of the embodiments of the present invention, according to the distribution of point cloud data on the surfaces of all magnetic poles, a specific method for obtaining the machining height difference of each magnetic pole is: Perform horizontal plane fitting on all point cloud data on the surface of all magnetic poles to obtain the overall processing base plane of the magnetic poles; for any magnetic pole on the cyclotron, perform horizontal plane fitting on all point cloud data on the surface of any magnetic pole to obtain the processing base plane of any magnetic pole; take the distance between the overall processing base plane of the magnetic pole and the processing base plane of any magnetic pole as the processing height difference of any magnetic pole; Preferably, in some implementations of the embodiments of the present invention, the specific method for obtaining the adjusted cutting depth parameter of each magnetic pole according to the machining height difference, the degree of cutting abnormality, the average roughness and the initial cutting depth is: For any magnetic pole on the cyclotron, the average roughness of any magnetic pole is compared with the target roughness parameter The difference is recorded as the first difference; the product of the first difference and the cutting abnormality degree of any one of the magnetic poles is recorded as the first product; the ratio of the first product to the machining height difference of any one of the magnetic poles is recorded as the cutting depth adjustment coefficient; The product of the initial cutting depth and the cutting depth adjustment coefficient is recorded as the cutting depth adjustment value; the difference between the initial cutting depth and the cutting depth adjustment value is used as the adjusted cutting depth parameter of any one of the magnetic poles; The specific formula is: In the formula, represents the adjusted cutting depth parameter of the magnetic pole; Indicates the initial cutting depth; Indicates the degree of abnormal cutting of the magnetic pole; Indicates the average roughness of the magnetic pole; represents the target roughness parameter; Indicates the machining height difference of the magnetic pole; represents the linear normalization function.

[0038] It should be noted that the processing height difference reflects the current remaining amount of the pole processing, and the remaining amount reflects the fault tolerance of the pole side processing. The larger the processing height difference, the higher the fault tolerance, and the larger the adjusted cutting depth parameter; as the processing height difference decreases during the layer cutting process, the processing accuracy of the pole should also become higher and higher; when the roughness does not meet the standard, the greater the difference between the average roughness of the pole and the theoretical roughness, the greater the corresponding cutting abnormality, which means that the accuracy of the pole side processing is smaller, more cutting adjustments are required, more fault tolerance space is required for cutting trial and error, and the corresponding cutting depth should be reduced; if there is currently abnormal cutting of the pole, that is, the greater the degree of cutting abnormality, more pole processing fault tolerance space is required, and a smaller cutting depth is required.

[0039] It should be noted that while the magnetic poles have high processing accuracy, they also need to meet the requirements of consistency, symmetry and uniformity; therefore, the roughness of each magnetic pole must be consistent and of the same height; the same height can be achieved by using the same cutting depth for all magnetic poles during the cutting process; therefore, the cutting parameters are corrected considering the influence of roughness.

[0040] Preferably, in some implementations of the embodiments of the present invention, all magnetic poles are screened according to the local roughness of each point cloud data on the surface of each magnetic pole, and the specific method for obtaining the magnetic poles to be adjusted and the non-adjusted magnetic poles is: For any magnetic pole on the cyclotron, the standard deviation of the local roughness of all point cloud data on the surface of the any magnetic pole is recorded as the roughness consistency of the any magnetic pole; Preset a fluctuation parameter , wherein this embodiment is based on This example is described as an example, and this embodiment is not specifically limited. Depends on the specific implementation situation; If the roughness consistency of any of the magnetic poles is less than or equal to the fluctuation parameter , record any one of the magnetic poles as a non-adjusted magnetic pole; if the roughness consistency of any one of the magnetic poles is greater than the fluctuation parameter , any one of the magnetic poles is recorded as the magnetic pole to be adjusted.

[0041] Preferably, in some implementations of the embodiments of the present invention, according to the difference in the adjusted cutting speed parameter, the adjusted cutting feed parameter and the adjusted cutting depth parameter between the magnetic pole to be adjusted and the non-adjusted magnetic pole, the specific method for obtaining the adjusted cutting parameter of the upper magnetic pole of the cyclotron is: For any non-adjustment magnetic pole, the absolute value of the difference between the average roughness of the any non-adjustment magnetic pole and the target roughness is recorded as the target difference of the any non-adjustment magnetic pole; among all non-adjustment magnetic poles, the non-adjustment magnetic pole with the smallest target difference is recorded as the target magnetic pole; The normalized value of the absolute value of the difference between the average roughness of all magnetic poles to be adjusted and the average roughness of the target magnetic pole is recorded as the roughness influence factor; The absolute value of the difference between the average of the adjusted cutting speed parameters of all magnetic poles to be adjusted and the adjusted cutting speed parameter of the target magnetic pole is recorded as the cutting speed influence factor; the product of the cutting speed influence factor and the roughness influence factor is recorded as the cutting speed correction factor; the difference between the adjusted cutting speed parameter of the target magnetic pole and the cutting speed correction factor is recorded as the corrected cutting speed parameter; The absolute value of the difference between the average of the adjusted cutting feed parameters of all the magnetic poles to be adjusted and the adjusted cutting feed parameter of the target magnetic pole is recorded as the cutting feed influence factor; the product of the cutting feed influence factor and the roughness influence factor is recorded as the cutting feed correction factor; the difference between the adjusted cutting feed parameter of the target magnetic pole and the cutting feed correction factor is recorded as the corrected cutting feed parameter; The absolute value of the difference between the average of the adjusted cutting depth parameters of all the magnetic poles to be adjusted and the adjusted cutting depth parameter of the target magnetic pole is recorded as the cutting depth influence factor; the product of the cutting depth influence factor and the roughness influence factor is recorded as the cutting depth correction factor; the difference between the adjusted cutting depth parameter of the target magnetic pole and the cutting depth correction factor is recorded as the corrected cutting depth parameter; The corrected cutting speed parameter, the corrected cutting feed parameter and the corrected cutting depth parameter are used as the corrected cutting parameters of the upper magnetic pole of the cyclotron.

[0042] So far, the corrected cutting parameters of the upper magnetic pole of the cyclotron are obtained by the above method.

[0043] Step S004: performing high-precision machining on the side surfaces of the cyclotron straight-edge sector-shaped magnetic poles based on the corrected cutting parameters of the magnetic poles.

[0044] Preferably, in some implementations of the embodiments of the present invention, the specific method for high-precision machining of the side surface of the straight-edge sector-shaped magnetic pole of the cyclotron based on the corrected cutting parameters of the magnetic pole is: Preset a height parameter , wherein this embodiment is based on This example is described as an example, and this embodiment is not specifically limited. Depends on the specific implementation situation; According to the corrected cutting parameters of the upper magnetic pole of the cyclotron, the cutting parameters of the cyclotron are adjusted, and the cutting of the upper magnetic pole of the cyclotron is carried out until the average value of the machining height difference of all the magnetic poles on the cyclotron is less than the height parameter .

[0045] As an embodiment, the specific steps of cutting the upper magnetic pole of the cyclotron using the corrected cutting parameters include: 1. After semi-finishing of the pole, a 3mm reserve is left on each surface.

[0046] 2. Choose high-precision large-scale CNC gantry boring and milling machines and shock-proof cutting tool bars.

[0047] 3. Test milling, cutting volume 0.5mm, cutting depth 1mm test cutting processing. When the CNC machining program used by the machine tool is compiled during the test cutting, the layer cutting priority programming strategy is adopted, first of all, to ensure the same height, the characteristics are consistent and symmetrical.

[0048] 4. The laser tracker checks the machining accuracy of the magnetic pole side.

[0049] 5. Fine boring of center hole meets drawing requirements.

[0050] 6. Use the center fine boring hole as a reference to check the relative values ​​of each side surface, compare with the results of the laser tracker test, and record the relative values.

[0051] 7. Finish milling the side, the finishing cutting amount is based on the corrected cutting feed parameter, the cutting speed is based on the corrected cutting speed parameter, and the cutting depth is 1mm based on the corrected cutting depth parameter.

[0052] 8. Fine-tune the side surface, and correct the side processing according to the relative value of the center fine boring hole. The relative value error of each surface should be controlled within 0.02mm.

[0053] 9. Use a solid carbide milling cutter to fine mill the assembly surface of the insert. After multiple millings, the relative value error of each surface is controlled within 0.02mm.

[0054] At this point, this embodiment is completed.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision machining method for the side of a cyclotron straight-edge sector-shaped magnetic pole, characterized in that: The method comprises the following steps: According to the point cloud data on the surface of each magnetic pole, the average roughness of each magnetic pole and the local roughness of each point cloud data on the surface of each magnetic pole are obtained; the point cloud data on the surface of each magnetic pole are screened by the local roughness to obtain the abnormal processing area of ​​each magnetic pole; according to the proportion of the abnormal processing area, the degree of cutting abnormality of each magnetic pole is obtained; According to the degree of cutting abnormality and the initial cutting speed, the adjusted cutting speed parameters of each magnetic pole are obtained; according to the adjusted cutting speed parameters and the initial cutting feed, the adjusted cutting feed parameters of each magnetic pole are obtained; according to the distribution of point cloud data on the surfaces of all magnetic poles, the processing height difference of each magnetic pole is obtained; according to the processing height difference, the degree of cutting abnormality, the average roughness and the initial cutting depth, the adjusted cutting depth parameters of each magnetic pole are obtained; according to the local roughness of each point cloud data on the surface of each magnetic pole, all magnetic poles are screened to obtain the magnetic poles to be adjusted and the non-adjusted magnetic poles; according to the differences in the adjusted cutting speed parameters, the adjusted cutting feed parameters and the adjusted cutting depth parameters between the magnetic poles to be adjusted and the non-adjusted magnetic poles, the corrected cutting parameters of the magnetic poles on the cyclotron are obtained, and the side surfaces of the straight-edge sector-shaped magnetic poles of the cyclotron are processed with high precision.

2. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The specific method of obtaining the average roughness of each magnetic pole and the local roughness of each point cloud data on the surface of each magnetic pole according to the point cloud data on the surface of each magnetic pole is as follows: For any magnetic pole on the cyclotron, inputting point cloud data of the surface of the any magnetic pole into a roughness measuring instrument to obtain the roughness of all point cloud data on the surface of the any magnetic pole; Taking the mean value of the roughness of all point cloud data on the surface of any one magnetic pole as the average roughness of any one magnetic pole; For any point cloud data on any magnetic pole surface, a neighborhood parameter is preset. , taking any point cloud data as the center of the spherical window, obtain the radius A spherical window is formed, and the spherical window is recorded as the local neighborhood range of any point cloud data; the average value of the roughness of all point cloud data within the local neighborhood range of any point cloud data is taken as the local roughness of any point cloud data.

3. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The point cloud data on the surface of each magnetic pole is screened by local roughness to obtain the abnormal processing area of ​​each magnetic pole, including the specific method of: Preset a target roughness parameter For any point cloud data on the surface of any magnetic pole on the cyclotron, if the local roughness of any point cloud data is greater than or equal to the target roughness parameter , record any one of the point cloud data as abnormal point cloud data; use the Convex Hull algorithm to restrict all abnormal point cloud data on the surface of any one of the magnetic poles to form multiple closed areas, and all of them are recorded as abnormal processing areas.

4. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The specific method for obtaining the degree of cutting abnormality of each magnetic pole according to the proportion of abnormal processing area is as follows: For any abnormal processing area of ​​any magnetic pole on the cyclotron, the ratio of the number of all point cloud data in the any abnormal processing area to the number of all point cloud data on the surface of any magnetic pole is recorded as the area ratio of the any abnormal processing area; the normalized value of the product of the cumulative sum of the area ratios of all abnormal processing areas of any magnetic pole and the number of all abnormal processing areas of any magnetic pole is taken as the cutting abnormality degree of any magnetic pole.

5. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The method of obtaining the adjusted cutting speed parameter of each magnetic pole according to the cutting abnormality degree and the initial cutting speed includes: For any magnetic pole on the cyclotron, the product of the cutting abnormality degree of the any magnetic pole, the inverse of the current cutting processing times and the initial cutting speed is recorded as the cutting speed adjustment factor of the any magnetic pole; the sum of the initial cutting speed of the any magnetic pole and the cutting speed adjustment factor is taken as the adjusted cutting speed parameter of the any magnetic pole.

6. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The method of obtaining the adjusted cutting feed parameter of each magnetic pole according to the adjusted cutting speed parameter and the initial cutting feed includes: For any magnetic pole on the cyclotron, the normalized value of the difference between the adjusted cutting speed parameter of any magnetic pole and the initial cutting speed is recorded as the cutting speed difference value; the product of the cutting speed difference value and the initial cutting feed of any magnetic pole is recorded as the cutting feed adjustment factor; the difference between the initial cutting feed of any magnetic pole and the initial cutting feed is used as the adjusted cutting feed parameter of any magnetic pole.

7. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The specific method of obtaining the processing height difference of each magnetic pole according to the distribution of the point cloud data of all magnetic pole surfaces is as follows: All point cloud data on the surfaces of all magnetic poles are fitted in a horizontal plane to obtain the overall processing base plane of the magnetic poles; for any magnetic pole on the cyclotron, all point cloud data on the surface of any magnetic pole are fitted in a horizontal plane to obtain the processing base plane of the any magnetic pole; the distance between the overall processing base plane of the magnetic pole and the processing base plane of any magnetic pole is used as the processing height difference of the any magnetic pole.

8. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 3, characterized in that: The method of obtaining the adjusted cutting depth parameter of each magnetic pole according to the machining height difference, the degree of cutting abnormality, the average roughness and the initial cutting depth includes: For any magnetic pole on the cyclotron, the average roughness of any magnetic pole is compared with the target roughness parameter The difference is recorded as the first difference; The product of the first difference and the cutting abnormality degree of any one of the magnetic poles is recorded as the first product; the ratio of the first product to the machining height difference of any one of the magnetic poles is recorded as the cutting depth adjustment coefficient; The product of the initial cutting depth and the cutting depth adjustment coefficient is recorded as the cutting depth adjustment value; the difference between the initial cutting depth and the cutting depth adjustment value is used as the adjusted cutting depth parameter of any one magnetic pole.

9. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The specific method of screening all magnetic poles according to the local roughness of each point cloud data on the surface of each magnetic pole to obtain the magnetic poles to be adjusted and the magnetic poles not to be adjusted includes: For any magnetic pole on the cyclotron, the standard deviation of the local roughness of all point cloud data on the surface of the any magnetic pole is recorded as the roughness consistency of the any magnetic pole; Preset a fluctuation parameter , if the roughness consistency of any of the magnetic poles is less than or equal to the fluctuation parameter , record any one of the magnetic poles as a non-adjusted magnetic pole; if the roughness consistency of any one of the magnetic poles is greater than the fluctuation parameter , any one of the magnetic poles is recorded as the magnetic pole to be adjusted.

10. The high-precision machining method for the side surface of a cyclotron straight-edge sector-shaped magnetic pole according to claim 1, characterized in that: The method of obtaining the corrected cutting parameters of the upper magnetic pole of the cyclotron according to the difference between the adjusted cutting speed parameter, the adjusted cutting feed parameter and the adjusted cutting depth parameter between the magnetic pole to be adjusted and the non-adjusted magnetic pole includes the following specific methods: For any non-adjustment magnetic pole, the absolute value of the difference between the average roughness of the any non-adjustment magnetic pole and the target roughness is recorded as the target difference of the any non-adjustment magnetic pole; among all non-adjustment magnetic poles, the non-adjustment magnetic pole with the smallest target difference is recorded as the target magnetic pole; The normalized value of the absolute value of the difference between the average roughness of all magnetic poles to be adjusted and the average roughness of the target magnetic pole is recorded as the roughness influence factor; The absolute value of the difference between the average of the adjusted cutting speed parameters of all the magnetic poles to be adjusted and the adjusted cutting speed parameter of the target magnetic pole is recorded as the cutting speed influence factor; the product of the cutting speed influence factor and the roughness influence factor is recorded as the cutting speed correction factor; The difference between the adjusted cutting speed parameter of the target magnetic pole and the cutting speed correction factor is recorded as the corrected cutting speed parameter; Similarly, the corrected cutting feed parameter and the corrected cutting depth parameter are obtained; The corrected cutting speed parameter, the corrected cutting feed parameter and the corrected cutting depth parameter are used as the corrected cutting parameters of the upper magnetic pole of the cyclotron.

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